* add FFILibraryFinder helper to find libraries in the standard directories for each

    platform. They are still incomplete (since linux in particular has a lot), but is a begining.

    * [big images] Calypso replacement of TabManagerMorph with SpNotebookMorph (allowing lazy loading instead spawning a fork)

    * Pharo 9: merge Spec2 0.2.1

    * [spec2] fix several issues in SpNotebookMorph related to theming but not exclusive

    * [spec2] remove some bad usages of do: #symbol

    * [spec2] solve a problem with $^ character in dead keyboards (I will need to map all dead

    code).